<?xml version="1.0" encoding="UTF-8"?>
<!-- Example -->
<ComplexObservableProperty xmlns="http://schemas.opengis.net/op"
    xmlns:gml="http://www.opengis.net/gml/3.2" xmlns:swe="http://www.opengis.net/swe/2.0"
    xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://schemas.opengis.net/op ../schemas/op.xsd" gml:id="ID002">
    <label>Mean Air Temperature over 24hr Period</label>
    <basePhenomenon xlink:href="http://myvocab.com/air_temperature"/>
    <qualifier>
        <StatisticalQualifier gml:id="24mean1">
            <statisticalOperator xlink:href="http://www.uncertml.org/statistics/mean"/>
            <statisticalPeriod>P1D</statisticalPeriod>
        </StatisticalQualifier>
    </qualifier>
</ComplexObservableProperty>
